Modeling Late-Time Stages of Type Ia Supernovae Explosions

Details Modeling Late-Time Stages of Type Ia Supernovae Explosions Modeling Late-Time Stages of Type Ia Supernovae Explosions

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0210p&link_type=abstract

American Astronomical Society Meeting 208, #2.10; Bulletin of the American Astronomical Society, Vol. 38, p.80

Statistics

Computation

Scientific paper

We present the method for computation of fluid flows characterized by the large degree of expansion/contraction and in which the fluid velocity is dominated by the bulk component associated with the expansion/contraction and/or rotation of the flow. We consider the formulation of Euler equations of fluid dynamics in a homologously expanding/contracting and/or rotating reference frame. The frame motion is adjusted to minimize local fluid velocities. Such approach allows to accommodate very efficiently large degrees of change in the flow extent. Moreover, it eliminates the high Mach number problem in the flows of interest and allows for significantly larger time steps compared to the traditional moving mesh techniques. We discuss results of the application of the method to simulations of Type Ia supernovae explosions followed to the stage of free ballistic expansion. Such first principles modeling of late-time stages of SNe ejecta evolution provides the possibility to consider the effect of processes such as turbulent mixing and nickel decay heating of the ejecta material on the structure of the system and is crucial for the realistic comparison of theoretical models of Type Ia SNe with observational data.This work is supported by the ASC Alliances Flash Center under the Contract with the Department of Energy B523820.

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